body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

main {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

h1 {
    text-align: center;
}

form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

label {
    font-weight: bold;
}

input, select, textarea, button {
    font-size: 16px;
    padding: 10px;
}

button {
    background-color: #007BFF;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    padding: 10px 20px;
}

button:hover {
    background-color: #0056b3;
}

.response-message {
    margin-top: 20px;
    padding: 10px;
    font-size: 16px;
    color: white;
    border-radius: 5px;
    display: none; /* 默认隐藏 */
}

.response-message.success {
    background-color: #28a745;
}

.response-message.error {
    background-color: #dc3545;
}
